The "Other Girl"

It turns out

Minnie works in the hat shop
And falls in love with Barnaby,
Who, sadly, is not played by Nathan.
Instead, Barnaby is played by this kid named
Hayley Kress, who is not a girl,
but a boy.
“Isn’t Hayley a girl’s name?”
Caitlin asks.
Hayley says, “Thanks, Captain Obvious.
And here I thought brunettes were smart.”
Oh God.
He’s British.
♠ ♠ ♠
For those of you who haven't seen Hello, Dolly! here's the Wikipedia page.